Hubble’s image of Markarian 231 reveals the nearest quasar to Earth, 600 million light-years away, with two supermassive black holes. Hubble’s image shows a spiral galaxy passing through NGC 1275, ...
This illustration shows a binary black hole at the centre of the quasar Markarian 231, outshining billions of stars. This image shows a possible seed for a supermassive black hole. Two seeds were ...